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mark point A representing 4 on number line .Now construct AB of unit length perpendicular to Oa .Then taking O as centre and OB as radius. Draw an arc intersecting number line at C .C is represented as √17.

√16 = 4

√17 = √ (42 +12 )

And represent it on number line

√17 = √ (42 +12 )

And represent it on number line